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annotate src/constants.rs @ 62:d83623951070

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Further improve docs and put `conv` behind a feature gate.
author Paul Fisher <paul@pfish.zone>
date Wed, 21 May 2025 23:10:09 -0400
parents 05cc2c27334f
children a7aa5ca0d00d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 //! Constants and enum values from the PAM library.
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2
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3 use bitflags::bitflags;
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4 use libc::{c_int, c_uint};
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5 use num_derive::FromPrimitive;
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6 use num_traits::FromPrimitive;
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7 use std::any;
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8 use std::marker::PhantomData;
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9
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10 bitflags! {
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11 /// The available PAM flags.
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12 ///
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13 /// See `/usr/include/security/_pam_types.h` for more details.
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14 #[derive(Debug, PartialEq)]
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15 #[repr(transparent)]
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16 pub struct Flags: c_uint {
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17 /// Authentication service should not generate any messages.
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18 const SILENT = 0x8000;
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19 /// The service should return [ErrorCode::AuthError] if the user
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20 /// has a null authentication token.
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21 const DISALLOW_NULL_AUTHTOK = 0x0001;
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22 /// Set user credentials for an authentication service.
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23 const ESTABLISH_CRED = 0x0002;
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24 /// Delete user credentials associated with
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25 /// an authentication service.
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26 const DELETE_CRED = 0x0004;
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27 /// Reinitialize user credentials.
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28 const REINITIALIZE_CRED = 0x0008;
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29 /// Extend the lifetime of user credentials.
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30 const REFRESH_CRED = 0x0010;
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31 /// The password service should only update those passwords
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32 /// that have aged. If this flag is _not_ passed,
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33 /// the password service should update all passwords.
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34 const CHANGE_EXPIRED_AUTHTOK = 0x0020;
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35 }
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36 }
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37
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38 /// Styles of message that are shown to the user.
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39 #[derive(Debug, PartialEq, FromPrimitive)]
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40 #[non_exhaustive] // non-exhaustive because C might give us back anything!
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41 pub enum MessageStyle {
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42 /// Requests information from the user; will be masked when typing.
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43 PromptEchoOff = 1,
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44 /// Requests information from the user; will not be masked.
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45 PromptEchoOn = 2,
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46 /// An error message.
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47 ErrorMsg = 3,
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48 /// An informational message.
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49 TextInfo = 4,
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50 /// Yes/No/Maybe conditionals. Linux-PAM specific.
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51 RadioType = 5,
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52 /// For server–client non-human interaction.
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53 /// NOT part of the X/Open PAM specification.
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54 BinaryPrompt = 7,
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55 }
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57 impl TryFrom<c_int> for MessageStyle {
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58 type Error = InvalidEnum<Self>;
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59 fn try_from(value: c_int) -> std::result::Result<Self, Self::Error> {
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60 Self::from_i32(value).ok_or(value.into())
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61 }
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62 }
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63
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64 impl From<MessageStyle> for c_int {
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65 fn from(val: MessageStyle) -> Self {
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66 val as Self
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67 }
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68 }
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69
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70 /// The Linux-PAM error return values. Success is an Ok [Result].
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71 ///
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72 /// Most abbreviations (except `AuthTok` and `Max`) are now full words.
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73 /// For more detailed information, see
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74 /// `/usr/include/security/_pam_types.h`.
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75 #[allow(non_camel_case_types, dead_code)]
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76 #[derive(Copy, Clone, Debug, PartialEq, thiserror::Error, FromPrimitive)]
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77 #[non_exhaustive] // C might give us anything!
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78 pub enum ErrorCode {
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79 #[error("dlopen() failure when dynamically loading a service module")]
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80 OpenError = 1,
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81 #[error("symbol not found")]
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82 SymbolError = 2,
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83 #[error("error in service module")]
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84 ServiceError = 3,
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85 #[error("system error")]
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86 SystemError = 4,
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87 #[error("memory buffer error")]
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88 BufferError = 5,
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89 #[error("permission denied")]
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90 PermissionDenied = 6,
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91 #[error("authentication failure")]
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92 AuthenticationError = 7,
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93 #[error("cannot access authentication data due to insufficient credentials")]
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94 CredentialsInsufficient = 8,
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95 #[error("underlying authentication service cannot retrieve authentication information")]
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96 AuthInfoUnavailable = 9,
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97 #[error("user not known to the underlying authentication module")]
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98 UserUnknown = 10,
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99 #[error("retry limit reached; do not attempt further")]
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100 MaxTries = 11,
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101 #[error("new authentication token required")]
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102 NewAuthTokRequired = 12,
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103 #[error("user account has expired")]
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104 AccountExpired = 13,
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105 #[error("cannot make/remove an entry for the specified session")]
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106 SessionError = 14,
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107 #[error("underlying authentication service cannot retrieve user credentials")]
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108 CredentialsUnavailable = 15,
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109 #[error("user credentials expired")]
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110 CredentialsExpired = 16,
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111 #[error("failure setting user credentials")]
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112 CredentialsError = 17,
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113 #[error("no module-specific data is present")]
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114 NoModuleData = 18,
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115 #[error("conversation error")]
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116 ConversationError = 19,
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117 #[error("authentication token manipulation error")]
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118 AuthTokError = 20,
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119 #[error("authentication information cannot be recovered")]
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120 AuthTokRecoveryError = 21,
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121 #[error("authentication token lock busy")]
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122 AuthTokLockBusy = 22,
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123 #[error("authentication token aging disabled")]
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124 AuthTokDisableAging = 23,
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125 #[error("preliminary check by password service")]
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126 TryAgain = 24,
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127 #[error("ignore underlying account module, regardless of control flag")]
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128 Ignore = 25,
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129 #[error("critical error; this module should fail now")]
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130 Abort = 26,
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131 #[error("authentication token has expired")]
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132 AuthTokExpired = 27,
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133 #[error("module is not known")]
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134 ModuleUnknown = 28,
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135 #[error("bad item passed to pam_[whatever]_item")]
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136 BadItem = 29,
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137 #[error("conversation function is event-driven and data is not available yet")]
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138 ConversationAgain = 30,
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139 #[error("call this function again to complete authentication stack")]
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140 Incomplete = 31,
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141 }
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142
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143 /// A PAM-specific Result type with an [ErrorCode] error.
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144 pub type Result<T> = std::result::Result<T, ErrorCode>;
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145
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146 impl ErrorCode {
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147 /// Converts this [Result] into a C-compatible result code.
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148 pub fn result_to_c<T>(value: Result<T>) -> c_int {
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149 match value {
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150 Ok(_) => 0, // PAM_SUCCESS
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151 Err(otherwise) => otherwise.into(),
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152 }
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153 }
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154
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155 /// Converts a C result code into a [Result], with success as Ok.
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156 /// Invalid values are returned as a [Self::SystemError].
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157 pub fn result_from(value: c_int) -> Result<()> {
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158 match value {
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159 0 => Ok(()),
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160 value => Err(value.try_into().unwrap_or(Self::SystemError)),
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161 }
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162 }
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163 }
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164
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165 impl TryFrom<c_int> for ErrorCode {
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166 type Error = InvalidEnum<Self>;
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167
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168 fn try_from(value: c_int) -> std::result::Result<Self, Self::Error> {
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169 Self::from_i32(value).ok_or(value.into())
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170 }
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171 }
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172
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173 impl From<ErrorCode> for c_int {
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174 fn from(val: ErrorCode) -> Self {
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175 val as Self
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176 }
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177 }
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178
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179 /// Error returned when attempting to coerce an invalid C integer into an enum.
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180 #[derive(thiserror::Error)]
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181 #[error("{0} is not a valid {type}", type = any::type_name::<T>())]
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182 #[derive(Debug, PartialEq)]
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183 pub struct InvalidEnum<T>(c_int, PhantomData<T>);
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184
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185 impl<T> From<InvalidEnum<T>> for c_int {
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186 fn from(value: InvalidEnum<T>) -> Self {
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187 value.0
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188 }
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189 }
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190
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191 impl<T> From<c_int> for InvalidEnum<T> {
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192 fn from(value: c_int) -> Self {
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193 Self(value, PhantomData)
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194 }
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195 }
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196
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197 #[cfg(test)]
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198 mod tests {
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199 use super::*;
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200
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201 #[test]
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202 fn test_enums() {
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203 assert_eq!(Ok(MessageStyle::ErrorMsg), 3.try_into());
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204 assert_eq!(Err(InvalidEnum::from(999)), ErrorCode::try_from(999));
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205 assert_eq!(Ok(()), ErrorCode::result_from(0));
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206 assert_eq!(Err(ErrorCode::Abort), ErrorCode::result_from(26));
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207 assert_eq!(Err(ErrorCode::SystemError), ErrorCode::result_from(423));
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208 assert!(InvalidEnum::<MessageStyle>(33, PhantomData)
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209 .to_string()
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210 .starts_with("33 is not a valid "));
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211 }
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212 }